My order came with a cooltube, even the reflector wings. (Apollo horticulture 600watt switchable/dimmable ballast). And right now, where I'm from it is the cold months. Just introduced my first feeding of Fox Farms Grow Big veg nutes, gonna use every other watering to see how they fan out. But so far so good?
I leave the ducts open, and the mesh flap open to receive air from a standard floor-sitting house fan. The hot exhaust air leaves the room passively, through these vents.